Traverse drum

ABSTRACT

A traverse drum for use in a winding machine for winding yarn into packages comprising a roll and a plurality of transverse grooves, a central bore extending longitudinally of said roll adapted to be mounted on to a shaft of the winding machine and a metal reinforcement provided at each cross over location and at the apex locations of said grooves.

United States Patent [191 Kinariwala 7 1 TRAVERSE DRUM [76] Inventor: Natverlal Purshottamdas Kinariwala, 148 Garden Area, Maninagar, Ahmedabad-8 Gujarat, India [22] Filed: June 3, 1971 [21] Appl. No.: 149,671

[52] US. Cl. 242/43-2, 242/18 DD, 317/2 R, 317/2 C [51] Int. Cl B6511 54/48 [58] Field Of Search 242/432, 18 DD; 317/2 R, I 317/2 C, 2 H

[56] I References Cited UNITED STATES PATENTS 1,836,105 12/1931 Bood ..242/43.2

[451 Apr. 23, 1974 Huffman et al. 317/2' R 3,065,380 11/1962 3,128,957 4/1964 Fallscheer 242/43.2 3,480,217 11/1969 OBrien 242/432 Primary Examiner-Stanley N. Gilreath Attorney, Agent, or Firm-Hammond & Littell 57 ABSTRACT A traverse drum for use in a winding machine for winding yarn into packages comprising a roll and a plurality of transverse grooves, a central bore extending longitudinally of said roll adapted to be mounted on to a shaft of the winding machine and a metal reinforcement provided at each cross over locationand at the apex locations of said grooves.

5 Claims, 5 Drawing Figures .WTEPJI'EiJAPRZL'smm 111805053 sum 10F 2 venlor I In NATVERLA]. PURSHOTTAMDAS KINARIWALA HM W/ 122% A ltorneys grmg 12 3 AP R 2 3 i974 SHEET 2 BF 2 Inventor NATVERLAL PURSHOTTAMDAS KINARMALA' By 6 m Altorneyx TRAVERSE DRUM As known in the art, a traverse drum consists of a roll having plurality of grooves formed thereon and which rotates a package by peripheral contact therewith and simultaneously traversing theyarn longitudinally thereof. In order to provide a traverse to the yarn, it will be apparent that the grooves are formed on the roll with a particular configuration and resulting thereby in cross over location and apex locations of the grooves. It has been found in practice that the cross over locations and apex locations ends of the grooves tend to wear rapidly thereby necessitating replacement of the drum. In order to obviate such a disadvantage, it is known in the art to form a drum of a thermosetting moulding material and which is provided with a metal reinforcement at each of the said cross over locations and apex locations. The reinforcement elements provided at the apex locations were formed in such known drums during the process of moulding. However, the reinforcement elements provided-at the cross over cations of the grooves in such known drums were inserted subsequent to the process of moulding. In such instances, the slits were formed either during the process of moulding or subsequent thereto. Thereafter, a metallic reinforcement element was inserted in the said slit and retained therein by means of an adhesive. It will be apparent, that though such reinforcement elements do increase the operating life of the drum, several distinct disadvantages are associated therewith. One of such disadvantage is the cost factor of the drum since a considerable time and accuracy is required in providing the reinforcement elements at the cross over locations of the grooves. It will be apparent that in such known drums made of thermo-setting material or a metal, and which is moulded, the reinforcement elements at the cross over locations could not be provided during the process of moulding since it was not possible, hithertofore, to retain the said elements in position during the process of moulding. A further disadvantage associated with such known drums is that since the metal reinforcement elements are inserted only subsequent to the process of moulding, it was necessary to insert an individual or single reinforcement element at each intersection of the groove; Thus it was not possible hithertofore to provide a single and continuous reinforcement element between adjacent grooves. Another disadvantage associated with such known drums is that though the metal reinforcement did decrease the wear'at the cross over locations and at the apex loca-' tions of the grooves, the said metal reinforcements could not provide a discharge of static charge accumulated thereon.

The accumulation of static charge on the drum is a major disadvantage associated with thermo-setting moulding material drums known in the art. Such an accumulation of static charge is essentially prevalent with regard to synthetic yarns or blends containing synthetic fibres and wherein a considerable amount of static charge is deposited on the drum surfaces and in the grooves which does have detrimental effects on the yarn. Thus, in order to obviate such disadvantages, a traverse drum known in the art is made completely of metal and which is in contrast to a drum moulded from a thermo-setting material.

In such a known drum, chromium plated steel pipe having a plurality of openings is first fabricated. Thereafter preformed grooves made of metal are then held to the opening walls by means of an adhesive. Though in such a construction of a drum the accumulation of the static charge is not present, it will be apparent that the grooves cannot be highly polished and hence does not provide the smoothness and polish and which are the basic properties required for traverse drums. Furthermore, after a certain period of use, the adhesive deteriorates and weakens the bonding relation between the grooves and the drum. Another disadvantage associated with such known drums is the formation of rust on the surface of the drum and further, such drums are not found suitable for the efficient winding of finer' count yarns. An additional disadvantage associated with such metal drums is the cost thereof.

An object of this invention is to propose a traverse drum adapted for use in winding machines for winding yarn or like strandular materials into packages having reinforcement elements at the cross over locations and apex locations of the grooves and which elements are provided in said drum during the process of moulding.

A further object of this invention is to propose a traverse drum adapted for use in winding machines for winding yarn or like strandular materials into packages and whereinsaid drum has means for allowing a discharge of the static charge accumulated thereon.

Another object of this invention is to propose a traverse drum of the type herein referred and which is moulded.

A still further object of this invention is to propose a traverse drum of the type herein referred and which is simple to manufacture, cheap in original costs and effi cient.

According to this invention there is provided a traverse drum adapted for use in winding machines for winding yarn or like strandular materials into packages comprising a moulded cylinder or a roll having a plurality of traverse grooves formedthereon, a central bore extending longitudinally of said roll and adapted to be mounted on and'held to a shaft of'said winding machine, a metal reinforcement provided at each of the cross over locations and at the apex locations of said grooves characterized in at least one retaining element provided within or on the surface of said roll, said retaining element being in contact with at least one reinforcement element provided at the cross over locations of a groove and such that the said retaining element retains the said reinforcement element in position during the process of moulding the said roll.

In accordance with one embodiment of this invention the retaining element is in contact with the reinforcement elements provided at the apex locations and with the elements provided at the cross over locations of said grooves.

In accordance with another embodiment of this invention, the said drum comprises of a first and second retaining element, said first retaining element adapted to retain during the process of moulding, and be in contact with the reinforcement elements provided at a first apex location and cross over location or locations of the groove provided on the same side of the said first apex location of the groove, said second retaining element adapted to retain, during the process of moulding, and be in contact with the reinforcement elements provided at a second apex location and the cross over location or locations of the grooves provided on that side of said drum.

In accordance with one embodiment of this invention and when the drum is made of a thermo-setting material, the said retaining element is also an electric] conducting element and whereby the static charge absorbed by the metal reinforcement element or elements is allowed to travel to said shaft. In order that the static charge accumulated at the reinforcement elements may be discharged, it will be apparent that the said elements should be earthed. In accordance with one embodiment of this invention, such an earthing is effected by providing an opening in said drum for receiving a locking bolt, said bolt being in contact with the retaining element and a shaft of the winding machine. Thus, the locking bolt provided two functions namely, firstly of locking the drum to the shaft and secondly of completing the electrical circuit of the reinforcement element or elements with said shaft. However, it is also within the scope of this invention to have any other mode of construction whereby the electrical circuit between the reinforcement element and the shaft is completed. By way of example one such construction could be that the retaining element itself is in contact with the shaft.

In accordance with another embodiment of this-invention and when the drumis formed by the process of moulding, but made of a metal such as aluminum alloy, it will be apparent that the retaining element need not necessarily also be a conducting element. Thus, the retaining element may or may not have any electrical connection with the shaft. In such an instance, the reinforcement elements should be of a material harder and/or having a high resistance to abrasion than that of .terial and as described hereinabove.

Further, in accordance with this invention, there is provided at least one conductor plate on the surface of said roll and having an electrical connection with said shaft and whereby the static charge absorbed on the surface of said roll is allowed to flow to the shaft through said conductor plate and locking bolt. The conductor plate in accordance with one embodiment of this invention, is provided on the surface of the said drum during the process of moulding. However, it will be apparent that the said conductor plate may also be provided on the said surface subsequent to the process of moulding.

Furtherobjects and advantages of this invention will be apparent from the ensuing description when read in conjunction with the accompanying drawings wherein:

FIG. 1 shows in perspective a traverse drum in accordance with one embodiment of this invention.

FIG. 2 shows a section of the traverse drum of FIG. 1 along line 2-2. FIG. 3 shows a perspective view of the traverse drum according to another embodiment of this invention.

FIG. 4 shows a section of the drum of FIG. 3 along the line 4-4.

the

crossover locations 3 and apex locations 4. As shown in the drawings, apex locations 4 are provided each with a metal reinforcement 5 and the crossover locations 3 are provided with metal reinforcement 6. In accordance with the prior art, the metal reinforcements 5 were provided during the process of moulding, whereas, the reinforcement 6 were provided subsequent to the process of moulding by means of providing slits at the said cross over locations and thereafter inserting and retaining the reinforcement element 6 by means of an adhesive. It will be apparent that such a method of inserting the reinforcements 6 is time consuming and thus require a high degree of accuracy and the disadvantages of which have already been described hereinabove. The reinforcements 6 could not hithertofore be provided during the process of moulding since the reinforcements 6 would then tend to get displaced upon application of a high pressure during the moulding process. In accordance with this invention, the reinforcements 6 are provided during the process of moulding and which is not known hithertofore.

element has arms 7a and 7b. Further the retaining element 7 has an opening 9 and through which the shank 10a ofa locking bolt 10 is received. An opening 11, cooperating with the opening 9, is provided, in the drum 1 for receiving the locking bolt 10. The locking bolt 10 has primarily two functions. The first function is to. lock the drum 1 on to a shaft 12 of a winding machine (not shown). The drum 1 includes a metal bushlZA engaging the shaft 12. The second function, and which forms an important concept of this invention, is to provide an electrical path for the flow of static charge from the reinforcement elements 5 and 6 to the shaft 12. Similarly the retaining element 7 has two inportant functions. The first function is similar to that of the bolt 10, namely it fonns one of the components for allowing the flow of thestatic charge absorbed at the reinforcement elements 5 and 6. In such an instance, the current flows from the elements 5 and 6 into the retaining element 7 and thereafter to the shaft 12 through thebolt 10. The second function, and which is of importance, is to retain the elements 5 and 6 in position during the process of moulding. It would be apparent that in the absence of the retaining element 7, it would not be possible to retain, in particular, the element 6 during the process of moulding.

The absorption of static charge from the elements 5 and 6 is of importance when winding synthetic yarn or blends containing syntheticfibres, However, in the instance of natural fibres, such as cotton, only a negligible amount of static charge is present in view of the moisture present in such yarns. In such an instance, it is not necessary to provide any such conducting means.

However, the cross over locations 3 and apex locations 4 still tend to get damaged and for which purpose it would be still necessary to provide the reinforcement elements 5 and 6. The reinforcement 5 may be provided duringthe process moulding in a manner as already known in the art. However, in order to provide the reinforcing element 6 during the'process of moulding, it would be necessary to still have a retaining element 7, but consisting only of an arm 7b. Thus, in such an instance, the retaining element 7 .can consist only of arm 7b when the element 5 is provided in a manner known in the art, or alternatively of arms 7a and 7b, when the element 5 is provided in accordance with the teachings of this invention. As shown in the drawings, a pair of retaining elements 7 and locking bolt 10 are provided. The drum of this invention may be manufactured by the use of a split mould.

Reference is now made to FIGS. 3 and 4 which show a drum, similar to that as illustrated in FIGS. 1 and 2 except that an electrical conducting means is also provided on the surfaces of the said drum. The electrical conducting means consists of a conductor plate 13 provided on the surface 14 of the drum 1. The plate 13 is provided on the interior surface thereof with projecting lugs 15 which assists in establishing a firm'grip of the plate 13 with the drum 1. Further, the plate 13 is in contact with a sleeve 16 and such that the sleeve 16 establishes a contact at one end with the plate 13 and at the other end 'with the retaining element 7. The sleeve 16 and the conductor plate 13 are provided during the process of moulding. The plate 13 is provided with an opening 17 cooperating with the opening 9 of the drum. Thus, when the drum 1 is held to the shaft 12 by the bolt 10, the static charge present on the surface 14 of the drum lis absorbed by the conductor plate 13, and which then flows to the sleeve 16 and finally to the shaft 12 through the retaining element 7 and bolt 10.

As shown in the drawings 13 are provided.

It will be apparent and in accordance with the another embodiment of this invention, the conductor plate 13 can be employed on traverse drums without the particular arrangement ofthe retaining element 7 as illustrated in FIGS. 3 and 4, For example, the reinforcement elements 5 and 6 need not have any electrical contact with the shaft 12 and may be provided in the manner already known in the art. One such way of providing the reinforcement element 6, and as already described hereinabove, is to provide slits at the cross over locations of the grooves and to introduce and adhere the reinforcing elements 6 therein by means of an adhesive,'such as epoxy resin. In such an instance, the conductor plate 13 is provided on the surface 14 of the two such conductor plates I I drum 1, and a bolt 10 is introduced in the openings 16 and9 of the conductor plate 13 and drum 1 respectively. However, in such an instance, it is necessary that the bolt 10 should have a head of such a dimension that it establishes a contact with the conductor 13, when in a tightened position. In such an instance, the current from the conductor plate 13 flows to the shaft 12 directly through the bolt 10. According to another embodiment, and when the elements 5 and 6 are provided in a manner already known in the art, the retaining element 7 may have any configuration which is in contact and retains the sleeve 16 in position during the process of moulding. In such an instance, the sleeve 16 is in contact with the conductor plate 13 and the retaining element 7 and the path of the current from the said plate 13 is similar to that as described with reference to FIGS. 3 and 4.

FIG. 5 shows one of the split sections 18 used in the split mould for the manufacture of the drum 1 of this invention. As shown in the drawings, ribs 19 are integrally provided on the inner surface of the'section l8 and the reinforcement elements 5 and 6 are adapted to rest on the said ribs 19. A hollow stud 20 is provided in said section 18 for accomodating a locking bolt 21.

The opening of the retaining element 7 cooperates with the opening 22 of the hollow stud 20 and whereby the locking bolt 21 extends within the opening 22 and the opening 9 of the retaining element 7. The sleeve 16 embraces the stud 20 and rests at one end on a support 23 of the conductor plate 13 and at the other end bears against the retaining element 7. It will be apparent that when the locking element bolt 21 is in an unlocked position, the conductor plate 13 would then get displaced. However, upon the locking bolt 21, the sleeve 16 firmly bears against the retaining element 7 and which thus, in turn, prevents the displacement of the conductor plate 13 which in the moulded drum will appear on the surface of said'drum l, and the other elements namely the retaining element 7 and the sleeve 16 which will appear within the moulded drum 1. Similarly, upon tightening of the locking bolt 21 the elements 5 and 6 are held in position during the process of moulding since the arms 7a and 7b of the retaining element 7 firmly bear against the said elements 5 and 6. It is to be noted that the locking bolt 21 is distinct to the bolt 10, since the bolt 21 is used for retaining the retaining element 7 which in turn retains sleeve 16 the conductor plate 13 and the elements 5 and 6, in position duringthe process of moulding. Upon completion of the moulding process, the bolt 21 is unlocked and removed from the section 18.

I claim:

l. A yarn traverse drum for guiding of yarn back and forth as the yarn is wound into apackage comprising a rotatable drum with helical grooves in which the yarn is guided and a longitudinally extending bore therethrough, said grooves being connected at apex intersections at which the traversing direction of the yarn is reversed and cross over intersections intermediate of the apexes, metal reinforcement elements at said apex intersections and cross over intersections, a retaining element of metal embedded in the body of the drum and extending along the length of the drum and in contact with said reinforcement elements, a driving shaft in said bore in said drum, a transverse opening in said drum,

a locking bolt in said transverse opening and in opening in the said retaining element, said locking bolt being in contact with said retaining element and said driving shaft, thereby providing completion of an electrical circuit for the discharge of static charge from the reinforcing elements to the said driving shaft.

2. A yarn traverse drum as claimed in claim 1, and

including two of said retaining elements oppositely disposed to each other embedded in the drum, said retaining elements being in contact with the respective reinforcement elements adjacent to the same.

3. A yarn traverse drum as claimed in claim 2 in which each said retaining element is in the form of a metal strip having bent ends which bent ends bear ment and the locking bolt.

5. A yarn traverse drum as claimed in claim 1 in which a metal bush is fitted around the driving shaft at the transverse bore in said drum and the locking bolt engages said metal sleeve. 

1. A yarn traverse drum for guiding of yarn back and forth as the yarn is wound into a package comprising a rotatable drum with helical grooves in which the yarn is guided and a longitudinally extending bore therethrough, said grooves being connected at apex intersections at which the traversing direction of the yarn is reversed and cross over intersections intermediate of the apexes, metal reinforcement elements at said apex intersections and cross over intersections, a retaining element of metal embedded in the body of the drum and extending along the length of the drum and in contact with said reinforcement elements, a driving shaft in said bore in said drum, a transverse opening in said drum, a locking bolt in said transverse opening and in opening in the said retaining element, said locking bolt being in contact with said retaining element and said driving shaft, thereby providing completion of an electrical circuit for the discharge of static charge from the reinforcing elements to the said driving shaft.
 2. A yarn traverse drum as claimed in claim 1, and including two of said retaining elements oppositely disposed to each other embedded in the drum, said retaining elements being in contact with the respective reinforcement elements adjacent to the same.
 3. A yarn traverse drum as claimed in claim 2 in which each said retaining element is in the form of a metal strip having bent ends which bent ends bear against the reinforcement elements at the apex intersections.
 4. A yarn traverse drum as claimed in claim 1 in which at least one metal conductor plate is fitted on the surface of the drum and a metal sleeve is fitted in the mouth of the transverse opening which sleeve is in contact with said conductor plate, the retaining element and the locking bolt.
 5. A yarn traverse drum as claimed in claim 1 in which a metal bush is fitted around the driving shaft at the transverse bore in said drum and the locking bolt engages said metal sleeve. 